'''
/*
 * @Author: wevsmy 
 * @Date: 2017-10-21 10:51:10 
 * @Last Modified by:   wevsmy 
 * @Last Modified time: 2017-10-21 10:51:10 
 */
'''
def fib():
    a = 0
    b = 1
    for i in range(6):
        yield b
        a,b = b,a+b
    return "ss"

